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title, tags, up
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| Lighting Controls |
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electrical-construction |
Lighting Controls
Requirements
Electrical Rooms
nfpa-70_110_requirements#110.26(D) Illumination.
Sensor Types
- Occupancy
- Vacancy
- Daylight
- Partition
Occupancy/Vacancy Sensor Technologies
- Passive Infrared (PIR)
- Ultrasonic
- "Dual Tech" (PIR and ultrasonic)
Switching/Communication
Dimming Terms
- trim --- refers to the minimum and maximum brightness levels (low-end and high-end trim respectively) a dimmer will reach. Usually adjustable.
Line Voltage
!
120--347VAC
Low Voltage
!
24V Class 2 control circuit
Digital
Generic "Standalone"
!
The examples below are typical of a generic system, with functionally identical features and topologies.
Includes wired (via twisted-pair-cable and 8P8C "RJ-45" connectors) and wireless (via RF) communication.
Generic "Centralized"
A "centralized" system refers
Digital Addressable Lighting Interface (DALI) ^dali
Digital Addressable Lighting Interface
Open protocol defined by IEC 62386.
4-Conductor Class 2 control circuit
%% Lutron's QS bares some resemblance to DALI. %%
Digital Multiplex (DMX) ^dmx
DMX512-A defined in ANSI E1.11-2008
Shielded twisted-pair-cable with XLR or 8P8C "RJ-45" connectors
See Also
[!quote] BACnet BACnet is a communication protocol for building automation and control (BAC) networks. It is defined by ANSI/ASHRAE 135 and ISO 16484-5.
Dimming Technologies
- Triac (Line voltage dim)
- Analog (0-10V dim)
- Digital
All these control methods are likely to appear in drawings.
0-10V Dimming
In conduit:
Southwire 64350501
SIMpull® 16/2 Low Voltage Signal Cable, Blue
This method is compliant with nfpa-70_725_control-circuits#725.136(I) Other Applications., which allows control circuits to share a raceway with power conductors if either all of the power conductors or all of the control conductors are themselves in a raceway, or in metal-sheathed, metal-clad, non--metallic-sheathed, or Type UF cable.
Triac Dimming
Triac dimmers work by chopping the AC power waveform. This reduces the output power, so the lamp dims.
[!info] "Triac" refers to the electronic component that does the wave-chopping.
Subtypes
There are two subtypes based on which side of the wave is chopped.
- Magnetic Low Voltage (MLV) -- AKA "Leading Edge" or "Forward Phase"
- Electronic Low Voltage (ELV) -- AKA "Trailing Edge" or "Reverse Phase"
The "magnetic" and "electronic" of MLV and ELV are holdovers from pre-LED days, having nothing to do with how they are used today. They are, unfortunately, the most common terms.
Important
"Triac" is sometimes used in contrast to ELV erroneously to mean MLV
There also exist "universal" or "phase select" dimmers, which can be switched between the two subtypes.
Digital Dimming
[!info] It is likely that "digitally dimmed" fixtures are 0-10V dimmed internally.